You'd write your email in a formal manner because your teachers are your elders and your supposed to respect them.
Hope this helps!
Yes because it has a subject which is both of the candidates and a verb that begins to explain what they are doing or normally do. They radiate confidence on camera.
"Both of the candidates" can be replaced with the word "they" and that may help you when deciding what is considered a complete sentence.
Should be written in answer format, usually done by asking the question first then the answers on the top or at the side. Lets say like in a Magazine Q&A.
Some people think that a tomato is a vegetable because tomatoes go in salads (which are vegetables) but they are wrong.
If a food has seeds then it is a fruit.
Tomatoes have seeds so this means a tomato is a fruit.
Hope this helped! :)